she must be at least thirty five years old.in ma opinion she____a:has b:is c:can d:must

She is at least five years old 和She must be at least five years old,区别 She must be at least forty .为什么要在must前加be?must后加be She must be at least thirty-five years old.In my opinion she() a.has b.is c.must 为什么? You must be at least 13 to she must be at least thirty five years old.in ma opinion she____a:has b:is c:can d:must I read she's twenty-nine,but she must be (填in on at except) least forty. she must be at least thirey-five years old.课文翻译是她至少也有35岁了 must be 怎么没翻译呢 you must be at least tevel 19 to enter She must play the piano for at least one hour.(对for at least one hour 提问) passwords must comtain at least I heard she was twenty,but she must be least thirty years old.哪错了 She must be at least forty.请问其中的at least是副词,还是介词短语,用来修饰哪个词?at least如果是副词,但副词只修饰动词（系V除外）,adv,adj,整个句子,没听说副词可以修饰名词.但为什么有些在线词 Please enter the desired username.The username must be at least 5 characters long. 1.The password you have entered is not valid.The password must be at least 8 characters long.2.Passwords must have at least 8 characters,made up of letters and at least 2 numbers.两句话的意思 Password must contain at least one letter passwords must contain at least one uppercase You must have at least onecomputer opponent passwords must contain at least 8 characters